Maybe you’re looking at it wrong - maybe the round before this one had Monzo at an inflated price, and the artificial inflation of prices has stopped being a thing now, so this price isn’t inflated, and Monzo’s previous price was so the increase is lower, than if both were or weren’t inflated.
The value of the company is what the investing company are willing to pay per share, and not what people on a forum think are contributing factors to the price, and want to throw high numbers around because they’ve invested and want to be 